import './waves.css';

const context = '@@wavesContext';

function handleClick(el, binding) {
	function handle(e) {
		const customOpts = Object.assign({}, binding.value);
		const opts = Object.assign(
			{
				ele: el, // 波纹作用元素
				type: 'hit', // hit 点击位置扩散 center中心点扩展
				color: 'rgba(0, 0, 0, 0.15)' // 波纹颜色
			},
			customOpts
		);
		const target = opts.ele;
		if (target) {
			target.style.position = 'relative';
			target.style.overflow = 'hidden';
			const rect = target.getBoundingClientRect();
			let ripple = target.querySelector('.waves-ripple');
			if (!ripple) {
				ripple = document.createElement('span');
				ripple.className = 'waves-ripple';
				ripple.style.height = ripple.style.width =
					Math.max(rect.width, rect.height) + 'px';
				target.appendChild(ripple);
			} else {
				ripple.className = 'waves-ripple';
			}
			switch (opts.type) {
				case 'center':
					ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + 'px';
					ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + 'px';
					break;
				default:
					ripple.style.top =
						(e.pageY -
							rect.top -
							ripple.offsetHeight / 2 -
							document.documentElement.scrollTop || document.body.scrollTop) +
						'px';
					ripple.style.left =
						(e.pageX -
							rect.left -
							ripple.offsetWidth / 2 -
							document.documentElement.scrollLeft || document.body.scrollLeft) +
						'px';
			}
			ripple.style.backgroundColor = opts.color;
			ripple.className = 'waves-ripple z-active';
			return false;
		}
	}

	if (!el[context]) {
		el[context] = {
			removeHandle: handle
		};
	} else {
		el[context].removeHandle = handle;
	}

	return handle;
}

export default {
	bind(el, binding) {
		el.addEventListener('click', handleClick(el, binding), false);
	},
	update(el, binding) {
		el.removeEventListener('click', el[context].removeHandle, false);
		el.addEventListener('click', handleClick(el, binding), false);
	},
	unbind(el) {
		el.removeEventListener('click', el[context].removeHandle, false);
		el[context] = null;
		delete el[context];
	}
};
